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Coupled Heterogeneous Nanowire-Nanoplate Planar Transistor Sensors for Giant (> 10 V/pH) Nernst Response

DSpace at IIT Bombay

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Title Coupled Heterogeneous Nanowire-Nanoplate Planar Transistor Sensors for Giant (> 10 V/pH) Nernst Response
 
Creator GO, J
NAIR, PR
REDDY, B
DORVEL, B
BASHIR, R
ALAM, MA
 
Subject pH sensor
field effect transistor
Nernst limit
nanowire-nanoplate
limit of biosensors
FIELD-EFFECT TRANSISTORS
 
Description We offer a comprehensive theory of pH response of a coupled ISFET sensor to show that the maximum achievable response is given by Delta V/Delta pH = 59 mV/pH x alpha, where 59 mV/pH is the intrinsic Nernst response and alpha an amplification factor that depends on the geometrical and electrical properties of the sensor and transducer nodes. While the intrinsic Nernst response of an electrolyte/site-binding interface is fundamental and immutable, we show that by using channels of different materials, areas, and bias conditions, the extrinsic sensor response can be increased dramatically beyond the Nernst limit. We validate the theory by measuring the pH response of a Si nanowire-nanoplate transistor pair that achieves >10 V/pH response and show the potential of the scheme to achieve (asymptotically) the theoretical lower limit of signal-to-noise ratio for a given configuration. We suggest the possibility of an even larger pH response based on recent trends in heterogeneous integration on the Si platform.
 
Publisher AMER CHEMICAL SOC
 
Date 2014-10-16T13:29:29Z
2014-10-16T13:29:29Z
2012
 
Type Article
 
Identifier ACS NANO, 6(7)5972-5979
http://dx.doi.org/10.1021/nn300874w
http://dspace.library.iitb.ac.in/jspui/handle/100/15668
 
Language en